drm/i915: Wait for LVDS panel power sequence
[linux-2.6.git] / drivers / mfd / tps6586x.c
1 /*
2  * Core driver for TI TPS6586x PMIC family
3  *
4  * Copyright (c) 2010 CompuLab Ltd.
5  * Mike Rapoport <mike@compulab.co.il>
6  *
7  * Based on da903x.c.
8  * Copyright (C) 2008 Compulab, Ltd.
9  * Mike Rapoport <mike@compulab.co.il>
10  * Copyright (C) 2006-2008 Marvell International Ltd.
11  * Eric Miao <eric.miao@marvell.com>
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License version 2 as
15  * published by the Free Software Foundation.
16  */
17
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/mutex.h>
23 #include <linux/slab.h>
24 #include <linux/gpio.h>
25 #include <linux/i2c.h>
26
27 #include <linux/mfd/core.h>
28 #include <linux/mfd/tps6586x.h>
29
30 /* GPIO control registers */
31 #define TPS6586X_GPIOSET1       0x5d
32 #define TPS6586X_GPIOSET2       0x5e
33
34 /* interrupt control registers */
35 #define TPS6586X_INT_ACK1       0xb5
36 #define TPS6586X_INT_ACK2       0xb6
37 #define TPS6586X_INT_ACK3       0xb7
38 #define TPS6586X_INT_ACK4       0xb8
39
40 /* interrupt mask registers */
41 #define TPS6586X_INT_MASK1      0xb0
42 #define TPS6586X_INT_MASK2      0xb1
43 #define TPS6586X_INT_MASK3      0xb2
44 #define TPS6586X_INT_MASK4      0xb3
45 #define TPS6586X_INT_MASK5      0xb4
46
47 /* device id */
48 #define TPS6586X_VERSIONCRC     0xcd
49
50 struct tps6586x_irq_data {
51         u8      mask_reg;
52         u8      mask_mask;
53 };
54
55 #define TPS6586X_IRQ(_reg, _mask)                               \
56         {                                                       \
57                 .mask_reg = (_reg) - TPS6586X_INT_MASK1,        \
58                 .mask_mask = (_mask),                           \
59         }
60
61 static const struct tps6586x_irq_data tps6586x_irqs[] = {
62         [TPS6586X_INT_PLDO_0]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
63         [TPS6586X_INT_PLDO_1]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
64         [TPS6586X_INT_PLDO_2]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
65         [TPS6586X_INT_PLDO_3]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
66         [TPS6586X_INT_PLDO_4]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
67         [TPS6586X_INT_PLDO_5]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
68         [TPS6586X_INT_PLDO_6]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
69         [TPS6586X_INT_PLDO_7]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
70         [TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
71         [TPS6586X_INT_ADC]      = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
72         [TPS6586X_INT_PLDO_8]   = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
73         [TPS6586X_INT_PLDO_9]   = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
74         [TPS6586X_INT_PSM_0]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
75         [TPS6586X_INT_PSM_1]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
76         [TPS6586X_INT_PSM_2]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
77         [TPS6586X_INT_PSM_3]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
78         [TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
79         [TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
80         [TPS6586X_INT_USB_DET]  = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
81         [TPS6586X_INT_AC_DET]   = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
82         [TPS6586X_INT_BAT_DET]  = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
83         [TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
84         [TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
85         [TPS6586X_INT_PP]       = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
86         [TPS6586X_INT_RESUME]   = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
87         [TPS6586X_INT_LOW_SYS]  = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
88         [TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
89 };
90
91 struct tps6586x {
92         struct mutex            lock;
93         struct device           *dev;
94         struct i2c_client       *client;
95
96         struct gpio_chip        gpio;
97         struct irq_chip         irq_chip;
98         struct mutex            irq_lock;
99         int                     irq_base;
100         u32                     irq_en;
101         u8                      mask_cache[5];
102         u8                      mask_reg[5];
103 };
104
105 static inline int __tps6586x_read(struct i2c_client *client,
106                                   int reg, uint8_t *val)
107 {
108         int ret;
109
110         ret = i2c_smbus_read_byte_data(client, reg);
111         if (ret < 0) {
112                 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
113                 return ret;
114         }
115
116         *val = (uint8_t)ret;
117
118         return 0;
119 }
120
121 static inline int __tps6586x_reads(struct i2c_client *client, int reg,
122                                    int len, uint8_t *val)
123 {
124         int ret;
125
126         ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
127         if (ret < 0) {
128                 dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
129                 return ret;
130         }
131
132         return 0;
133 }
134
135 static inline int __tps6586x_write(struct i2c_client *client,
136                                  int reg, uint8_t val)
137 {
138         int ret;
139
140         ret = i2c_smbus_write_byte_data(client, reg, val);
141         if (ret < 0) {
142                 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
143                                 val, reg);
144                 return ret;
145         }
146
147         return 0;
148 }
149
150 static inline int __tps6586x_writes(struct i2c_client *client, int reg,
151                                   int len, uint8_t *val)
152 {
153         int ret, i;
154
155         for (i = 0; i < len; i++) {
156                 ret = __tps6586x_write(client, reg + i, *(val + i));
157                 if (ret < 0)
158                         return ret;
159         }
160
161         return 0;
162 }
163
164 int tps6586x_write(struct device *dev, int reg, uint8_t val)
165 {
166         return __tps6586x_write(to_i2c_client(dev), reg, val);
167 }
168 EXPORT_SYMBOL_GPL(tps6586x_write);
169
170 int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
171 {
172         return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
173 }
174 EXPORT_SYMBOL_GPL(tps6586x_writes);
175
176 int tps6586x_read(struct device *dev, int reg, uint8_t *val)
177 {
178         return __tps6586x_read(to_i2c_client(dev), reg, val);
179 }
180 EXPORT_SYMBOL_GPL(tps6586x_read);
181
182 int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
183 {
184         return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
185 }
186 EXPORT_SYMBOL_GPL(tps6586x_reads);
187
188 int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
189 {
190         struct tps6586x *tps6586x = dev_get_drvdata(dev);
191         uint8_t reg_val;
192         int ret = 0;
193
194         mutex_lock(&tps6586x->lock);
195
196         ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
197         if (ret)
198                 goto out;
199
200         if ((reg_val & bit_mask) == 0) {
201                 reg_val |= bit_mask;
202                 ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
203         }
204 out:
205         mutex_unlock(&tps6586x->lock);
206         return ret;
207 }
208 EXPORT_SYMBOL_GPL(tps6586x_set_bits);
209
210 int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
211 {
212         struct tps6586x *tps6586x = dev_get_drvdata(dev);
213         uint8_t reg_val;
214         int ret = 0;
215
216         mutex_lock(&tps6586x->lock);
217
218         ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
219         if (ret)
220                 goto out;
221
222         if (reg_val & bit_mask) {
223                 reg_val &= ~bit_mask;
224                 ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
225         }
226 out:
227         mutex_unlock(&tps6586x->lock);
228         return ret;
229 }
230 EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
231
232 int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
233 {
234         struct tps6586x *tps6586x = dev_get_drvdata(dev);
235         uint8_t reg_val;
236         int ret = 0;
237
238         mutex_lock(&tps6586x->lock);
239
240         ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
241         if (ret)
242                 goto out;
243
244         if ((reg_val & mask) != val) {
245                 reg_val = (reg_val & ~mask) | val;
246                 ret = __tps6586x_write(tps6586x->client, reg, reg_val);
247         }
248 out:
249         mutex_unlock(&tps6586x->lock);
250         return ret;
251 }
252 EXPORT_SYMBOL_GPL(tps6586x_update);
253
254 static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
255 {
256         struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
257         uint8_t val;
258         int ret;
259
260         ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
261         if (ret)
262                 return ret;
263
264         return !!(val & (1 << offset));
265 }
266
267
268 static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
269                               int value)
270 {
271         struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);
272
273         tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET2,
274                         value << offset, 1 << offset);
275 }
276
277 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
278                                 int value)
279 {
280         struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
281         uint8_t val, mask;
282
283         tps6586x_gpio_set(gc, offset, value);
284
285         val = 0x1 << (offset * 2);
286         mask = 0x3 << (offset * 2);
287
288         return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
289 }
290
291 static int tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
292 {
293         if (!gpio_base)
294                 return 0;
295
296         tps6586x->gpio.owner            = THIS_MODULE;
297         tps6586x->gpio.label            = tps6586x->client->name;
298         tps6586x->gpio.dev              = tps6586x->dev;
299         tps6586x->gpio.base             = gpio_base;
300         tps6586x->gpio.ngpio            = 4;
301         tps6586x->gpio.can_sleep        = 1;
302
303         /* FIXME: add handling of GPIOs as dedicated inputs */
304         tps6586x->gpio.direction_output = tps6586x_gpio_output;
305         tps6586x->gpio.set              = tps6586x_gpio_set;
306         tps6586x->gpio.get              = tps6586x_gpio_get;
307
308         return gpiochip_add(&tps6586x->gpio);
309 }
310
311 static int __remove_subdev(struct device *dev, void *unused)
312 {
313         platform_device_unregister(to_platform_device(dev));
314         return 0;
315 }
316
317 static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
318 {
319         return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
320 }
321
322 static void tps6586x_irq_lock(struct irq_data *data)
323 {
324         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
325
326         mutex_lock(&tps6586x->irq_lock);
327 }
328
329 static void tps6586x_irq_enable(struct irq_data *irq_data)
330 {
331         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
332         unsigned int __irq = irq_data->irq - tps6586x->irq_base;
333         const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
334
335         tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
336         tps6586x->irq_en |= (1 << __irq);
337 }
338
339 static void tps6586x_irq_disable(struct irq_data *irq_data)
340 {
341         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
342
343         unsigned int __irq = irq_data->irq - tps6586x->irq_base;
344         const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
345
346         tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
347         tps6586x->irq_en &= ~(1 << __irq);
348 }
349
350 static void tps6586x_irq_sync_unlock(struct irq_data *data)
351 {
352         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
353         int i;
354
355         for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
356                 if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
357                         if (!WARN_ON(tps6586x_write(tps6586x->dev,
358                                                     TPS6586X_INT_MASK1 + i,
359                                                     tps6586x->mask_reg[i])))
360                                 tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
361                 }
362         }
363
364         mutex_unlock(&tps6586x->irq_lock);
365 }
366
367 static irqreturn_t tps6586x_irq(int irq, void *data)
368 {
369         struct tps6586x *tps6586x = data;
370         u32 acks;
371         int ret = 0;
372
373         ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
374                              sizeof(acks), (uint8_t *)&acks);
375
376         if (ret < 0) {
377                 dev_err(tps6586x->dev, "failed to read interrupt status\n");
378                 return IRQ_NONE;
379         }
380
381         acks = le32_to_cpu(acks);
382
383         while (acks) {
384                 int i = __ffs(acks);
385
386                 if (tps6586x->irq_en & (1 << i))
387                         handle_nested_irq(tps6586x->irq_base + i);
388
389                 acks &= ~(1 << i);
390         }
391
392         return IRQ_HANDLED;
393 }
394
395 static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
396                                        int irq_base)
397 {
398         int i, ret;
399         u8 tmp[4];
400
401         if (!irq_base) {
402                 dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
403                 return -EINVAL;
404         }
405
406         mutex_init(&tps6586x->irq_lock);
407         for (i = 0; i < 5; i++) {
408                 tps6586x->mask_cache[i] = 0xff;
409                 tps6586x->mask_reg[i] = 0xff;
410                 tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
411         }
412
413         tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
414
415         tps6586x->irq_base = irq_base;
416
417         tps6586x->irq_chip.name = "tps6586x";
418         tps6586x->irq_chip.irq_enable = tps6586x_irq_enable;
419         tps6586x->irq_chip.irq_disable = tps6586x_irq_disable;
420         tps6586x->irq_chip.irq_bus_lock = tps6586x_irq_lock;
421         tps6586x->irq_chip.irq_bus_sync_unlock = tps6586x_irq_sync_unlock;
422
423         for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
424                 int __irq = i + tps6586x->irq_base;
425                 irq_set_chip_data(__irq, tps6586x);
426                 irq_set_chip_and_handler(__irq, &tps6586x->irq_chip,
427                                          handle_simple_irq);
428                 irq_set_nested_thread(__irq, 1);
429 #ifdef CONFIG_ARM
430                 set_irq_flags(__irq, IRQF_VALID);
431 #endif
432         }
433
434         ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
435                                    "tps6586x", tps6586x);
436
437         if (!ret) {
438                 device_init_wakeup(tps6586x->dev, 1);
439                 enable_irq_wake(irq);
440         }
441
442         return ret;
443 }
444
445 static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
446                                           struct tps6586x_platform_data *pdata)
447 {
448         struct tps6586x_subdev_info *subdev;
449         struct platform_device *pdev;
450         int i, ret = 0;
451
452         for (i = 0; i < pdata->num_subdevs; i++) {
453                 subdev = &pdata->subdevs[i];
454
455                 pdev = platform_device_alloc(subdev->name, subdev->id);
456                 if (!pdev) {
457                         ret = -ENOMEM;
458                         goto failed;
459                 }
460
461                 pdev->dev.parent = tps6586x->dev;
462                 pdev->dev.platform_data = subdev->platform_data;
463
464                 ret = platform_device_add(pdev);
465                 if (ret) {
466                         platform_device_put(pdev);
467                         goto failed;
468                 }
469         }
470         return 0;
471
472 failed:
473         tps6586x_remove_subdevs(tps6586x);
474         return ret;
475 }
476
477 static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
478                                         const struct i2c_device_id *id)
479 {
480         struct tps6586x_platform_data *pdata = client->dev.platform_data;
481         struct tps6586x *tps6586x;
482         int ret;
483
484         if (!pdata) {
485                 dev_err(&client->dev, "tps6586x requires platform data\n");
486                 return -ENOTSUPP;
487         }
488
489         ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
490         if (ret < 0) {
491                 dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
492                 return -EIO;
493         }
494
495         dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
496
497         tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
498         if (tps6586x == NULL)
499                 return -ENOMEM;
500
501         tps6586x->client = client;
502         tps6586x->dev = &client->dev;
503         i2c_set_clientdata(client, tps6586x);
504
505         mutex_init(&tps6586x->lock);
506
507         if (client->irq) {
508                 ret = tps6586x_irq_init(tps6586x, client->irq,
509                                         pdata->irq_base);
510                 if (ret) {
511                         dev_err(&client->dev, "IRQ init failed: %d\n", ret);
512                         goto err_irq_init;
513                 }
514         }
515
516         ret = tps6586x_gpio_init(tps6586x, pdata->gpio_base);
517         if (ret) {
518                 dev_err(&client->dev, "GPIO registration failed: %d\n", ret);
519                 goto err_gpio_init;
520         }
521
522         ret = tps6586x_add_subdevs(tps6586x, pdata);
523         if (ret) {
524                 dev_err(&client->dev, "add devices failed: %d\n", ret);
525                 goto err_add_devs;
526         }
527
528         return 0;
529
530 err_add_devs:
531         if (pdata->gpio_base) {
532                 ret = gpiochip_remove(&tps6586x->gpio);
533                 if (ret)
534                         dev_err(&client->dev, "Can't remove gpio chip: %d\n",
535                                 ret);
536         }
537 err_gpio_init:
538         if (client->irq)
539                 free_irq(client->irq, tps6586x);
540 err_irq_init:
541         kfree(tps6586x);
542         return ret;
543 }
544
545 static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
546 {
547         struct tps6586x *tps6586x = i2c_get_clientdata(client);
548         struct tps6586x_platform_data *pdata = client->dev.platform_data;
549         int ret;
550
551         if (client->irq)
552                 free_irq(client->irq, tps6586x);
553
554         if (pdata->gpio_base) {
555                 ret = gpiochip_remove(&tps6586x->gpio);
556                 if (ret)
557                         dev_err(&client->dev, "Can't remove gpio chip: %d\n",
558                                 ret);
559         }
560
561         tps6586x_remove_subdevs(tps6586x);
562         kfree(tps6586x);
563         return 0;
564 }
565
566 static const struct i2c_device_id tps6586x_id_table[] = {
567         { "tps6586x", 0 },
568         { },
569 };
570 MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
571
572 static struct i2c_driver tps6586x_driver = {
573         .driver = {
574                 .name   = "tps6586x",
575                 .owner  = THIS_MODULE,
576         },
577         .probe          = tps6586x_i2c_probe,
578         .remove         = __devexit_p(tps6586x_i2c_remove),
579         .id_table       = tps6586x_id_table,
580 };
581
582 static int __init tps6586x_init(void)
583 {
584         return i2c_add_driver(&tps6586x_driver);
585 }
586 subsys_initcall(tps6586x_init);
587
588 static void __exit tps6586x_exit(void)
589 {
590         i2c_del_driver(&tps6586x_driver);
591 }
592 module_exit(tps6586x_exit);
593
594 MODULE_DESCRIPTION("TPS6586X core driver");
595 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
596 MODULE_LICENSE("GPL");